package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * <p>
 * RedisIdWorker
 * </p>
 *
 * @author flyduck
 * @since 2025/3/12
 */
@Component
public class RedisIdWorker {

    private static final long BEGIN_TIMESTAMP = 1640995200;
    private static final int COUNT_LENGTH = 32;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2022, 1, 1, 0, 0, 0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println("second = " + second);//1640995200
    }

    public long nextId(String keyPrefix){
        //1、生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;

        //2、生成序列号
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        long count = stringRedisTemplate.opsForValue().increment("incr:" + keyPrefix + ":" + date);

        //3、拼接并返回
        return timestamp << COUNT_LENGTH | count;
    }
}
